Telephone-receiver



(No Model.) L. TOWNSEND.

TELEPHONE RECEIVER. No. 348,429. Patented Aug. 31, 1886.

Nrren STATES PATENT Ormea..

LOUIS TOVNSEND, OF EVANSVILLE, INDIANA, ASSIGNOR TO JOSEPH L.

. BAY AND VILLIAM I3. VORTHEN, OF LITTLE ROOK, ARKANSAS.

TELEPHONE-RECEIVER.

SPECIFICATION forming part of Letters Patent No. 348,429, dated August 3l, 1886.

Application filed May 10, ISEF.

To all whom, it may concern.

Be it known that I, LOUIS TOWNSEND, of Evansville, in the county of Vanderburg and State of Indiana, have invented certain Improvements in Telephone-Rcceivers; and I hereby declare the followingto be a full, clear, and exact description of the same, reference being had to the accompanying drawings, making part of this specification, in which- Figure l is a side elevation of my improved receiver. Fig. 2 is a side elevation of the saine having the car-piece removed. Fig. 3 is a central vertical sectional view. Fig. 4 is a plan view with the car-piccc and diaphragm removed. Figs. 5 and 6 are details to be referred to.

My invention relates to rceciving-instrlr ments for speaking-telephones, and has for its object to provide an effective and certain reproduction of the effect of the sound-waves upon the transmitter.

To this end my invention consists in certain details of construction and combinations of devices, as hereinafter fully described, and specifically pointed out in the claims.

In order that those skilled in the art may make and use my invention, I will proceed to describe the exact manner in which I have carried it out.

In the said drawings,Ais amagnet, annular in structure, but having its poles separated in a manner hereinafter described. Exteriorly at the top and bottom, as seen at a c', this magnet is threaded to receive female threads on the interior of theear-picce Band thebase B', so that the side wall is the magnet. Surrounding the magnet A and covering the exposed portion is a strip of brass, I), set into a groove or recess, b, around the magnet, and

Serial No. 201.735.

(No model. i

this brass ring has brazed or otherwise secured to it a transverse brass block, d, having beveled edges c to Iit in beveled grooves c in the ends of the annular magnet and separate the poles of the magnet, while it also completes the circle of the case. To the innersurface ofthe magnet is secured ashclfor bracket, '15, which supports in the center of the instrument a projection, D, of the permanent magnet A, the said projection being surrounded by a coil, E, the ends a a of which pass to binding-posts F F to form the electrical connections. A screw, p, passes through the center of the base piece B into the projection D and securcsit as well as the surrounding spool.

Around the edge of the magnet A rests the thin metal'diaphragm G, the edge of which is clamped between the ear-piece,an intervening compressible washer, q, and the edge of the magnet. By this construction I am enabled to place the coil in a strong magnetic field and utilize the magnet for forming the body of the box.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. The annular magnet, divided as described, and having dovetailed ends, in combination with the rigid inserted block d, having beveled edges, substantially as described.

2. The annular magnet A, in combination with the connecting spring-bracket i, core D, adj nsti n g-screw p, extending through the case, coil E, diaphragm G, and proper electrical connections, substantially as set forth.

LOUIS TOVNSEND.

Witnesses:

J. \V. NEXsEN, H. P. MCNAIR. 

